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https://github.com/Samsung/escargot.git
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79 lines
2.6 KiB
C++
79 lines
2.6 KiB
C++
/*
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* Copyright (C) 2010 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef PageBlock_h
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#define PageBlock_h
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#ifdef ESCARGOT
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#include "WTFBridge.h"
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#endif
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namespace WTF {
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WTF_EXPORT_PRIVATE size_t pageSize();
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WTF_EXPORT_PRIVATE size_t pageMask();
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inline bool isPageAligned(void* address) { return !(reinterpret_cast<intptr_t>(address) & (pageSize() - 1)); }
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inline bool isPageAligned(size_t size) { return !(size & (pageSize() - 1)); }
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class PageBlock {
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public:
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PageBlock();
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PageBlock(void*, size_t, bool hasGuardPages);
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void* base() const { return m_base; }
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size_t size() const { return m_size; }
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operator bool() const { return !!m_realBase; }
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bool contains(void* containedBase, size_t containedSize)
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{
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return containedBase >= m_base
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&& (static_cast<char*>(containedBase) + containedSize) <= (static_cast<char*>(m_base) + m_size);
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}
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private:
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void* m_realBase;
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void* m_base;
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size_t m_size;
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};
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inline PageBlock::PageBlock()
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: m_realBase(0)
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, m_base(0)
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, m_size(0)
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{
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}
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inline PageBlock::PageBlock(void* base, size_t size, bool hasGuardPages)
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: m_realBase(base)
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, m_base(static_cast<char*>(base) + ((base && hasGuardPages) ? pageSize() : 0))
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, m_size(size)
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{
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}
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} // namespace WTF
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using WTF::pageSize;
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using WTF::isPageAligned;
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using WTF::isPageAligned;
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#endif // PageBlock_h
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